For a man who’s usually such an expert at reading people, especially you, Dazai’s never quite expecting your period when it hits. Despite the obvious warning of PMS, he’s still caught off guard. He called Kunikida and told him he wont come because you're 'unwell'

You're laying on the couch with blankets over you Dazai came with all of the pastries you’ve been craving, delicately wrapped in napkins and stashed in a gift bag. He claims to have baked them himself

"Got you some pastries!"